<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <script src="https://cdn.jsdelivr.net/npm/vue@2.6.10/dist/vue.js"></script>
</head>

<body>
    <div id="app">
        <button @click="fullName='xia xiaoxiao'">change</button>

        <h2>名字是{{fullName}}</h2>
        

    </div>
    <script>
        Vue.config.productionTip = false;

        const vm = new Vue({
            el: "#app",
            data() {
                return {
                    firstName: "Wang",
                    lastName: "zhongwang",
                };
            },
            //computed配置项,内部专门用来书写计算属性
            computed: {
                fullName: {
                   get(){
                    console.log("getter");
                     return (
                        this.firstName.toLowerCase() + " " + this.lastName.toLowerCase()
                    );
                   },
                   set(val){
                    console.log("setter"),val;
                    this.firstName = val.split("")[0];
                    this.lastName = val.split("")[1];
                   }
                   
                },
            },
        });
    </script>
</body>

</html>